Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Triple-junction solar cells based on halide perovskite materials have the potential to provide a low-cost alternative to the current dominant III-V multijunction technologies. To achieve competitive perovskite–perovskite–silicon or all-perovskite triple-junction devices, design of stable and efficient absorber materials with a bandgap around 2 eV for the top cells is critical1. Tuning the bandgap of formamidinium-based perovskites to 2 eV necessitates the use of compositions with high bromide-to-iodide ratios. However, mixed-halide, lead-based perovskites are known to undergo photoinduced halide segregation with increasing bromide content which may reduce cell performance2,3.
Herein, we explore the halide segregation processes in methylammonium-free perovskites with compositions FAPb(I0.3Br0.7)3 and FA0.83Cs0.17Pb(I0.3Br0.7)3 using in-situ photoluminescence and x-ray diffraction methods. We investigate the effect of atmosphere on halide segregation and quantify to what extent this effect induces losses in devices based on these compositions. Further, we explore the stability of these compositions under a variety of environmental stresses by investigating the impacts of humidity and temperature, specific to high-bromide content perovskites and their decomposition. This work builds understanding of the unique challenges in achieving viable 2 eV halide perovskite absorber layers for low-cost triple-junction solar cells.
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